Hi Ron,
Where you describe the use of the modelling clay "The next step is to fill the area below the annulus with moulding clay and produce a concave fillet", do you achieve the nice smooth concave surface simply using your fingers?
Do the cut flutes stick to the surface of the plasticard sufficiently well to stand up to the "Final cleaning up will be carried out before painting"?
I love your project and only came across it today when my son (now 42) pointed it out to me. He thought I would be interested as I started a similar one quite a few years ago but faltered with some of the details you have conquered so superbly – although I still have many of the pieces I made at that time. Do you intend constructing all three sets of viaducts, including the earliest CLC (lower level) one?
Regards,
Norm
